Embed binary in bash

complex-install.sh

#!/usr/bin/env bash

add_command() {
	echo "
lstart=\$(awk '/^__'${1}'_PAYLOAD_BEGIN__/ { print NR + 1; exit 0; }' \$0)
lend=\$(awk '/^__'${1}'_PAYLOAD_END__/ { print NR + 1; exit 0; }' \$0)

cat \$0 | head -n +\${lend} | tail -n +\${lstart} > \${dir}/${1}
chmod +x \${dir}/${1}"
}

add_tag() {
        echo __${1}_PAYLOAD_BEGIN__
        cat $(which ${1})
        echo
        echo __${1}_PAYLOAD_END__
}

main() {
	echo '#!/bin/sh

dir=$(mktemp -d)'

	add_command ls
	add_command who
	add_command date

	echo '
${dir}/ls
${dir}/who
${dir}/date'

	echo 'rm -rf ${dir}
exit'

	add_tag ls
	add_tag who
	add_tag date
}

main > shell.sh

simple-install.sh

#!/usr/bin/env bash

main() {
	echo '#!/bin/sh

dir=$(mktemp -d)
lstart=$(awk "/^__BEGIN__/ { print NR + 1; exit; }" $0)

tail $0 -n +${lstart} > ${dir}/bin
chmod +x ${dir}/bin

${dir}/bin

rm -rf ${dir}
exit
__BEGIN__'

	cat /bin/date
}

main > shell.sh